Cam-milling machine.



PATENTED MAY 23, 1905..

} S. A. HAND. 0m" MILLING MACHINE."

APPLICATION FILED NOV. 7, 1904.

5 SHEETS-SHEET 1.

INVENTOR. MW@/%ZZ- 7 ATTORNEY.

W1 T NESSES:

No. 790.298. PATENTED MAY 23, 1905.

s. A. HAND.

0am MILLING MACHINE. APPLICATION FILED NOV. 7, 1904.

6 SHEETS-SHEET 2.

WITNESSES. I I INVENTOR.

y yH7 w ATTORNEY.

N0. 79O,298. v PATENTED MAYZB, 1905.

s. A. HAND.

G AM MILLING MACHINE.

APPLICATION FILED NOV. 7. 1904.

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WITNESSES: v INVENTOR. p

. ATTORNEY.

PATENTED MAY 23, 1905; s. A; HAND. I 0m MILLING MACHINE;

APPLICATION FILED NOV. 7, 1 904.

5 SHEETS-SHEET 4.

rt 1 g WITNESSES.

[Nlf'E/VT9126M I Edi/ e y? 1 1 ATTORNEY S.A.HAND. 01 1.1, MILLINGMACHINE. APPLIOATI'ON-PILED NOV. 7, 1904.

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INVENTOR. W/(M4 ATTORNEY.

Patented May 23, 1905.

UNITED I STATES" PATENT OFFICE.

SAMUEL ASHTON HAND, OF CLEVELAND, OHIO, ASSIGNOR TO CHANDLER & PRICECOMPANY, OF CLEVELAND, OHIO.

CAM-MILLING MACHINE.

SPECIFICATION forming part of Letters Patent No. 790,298, dated May 23,1905. Application filed November "7, 1904. Serial No. 231,673.,

To all whom it may concern:

Be it known that I, SAMUEL AsI-rroN HAND, a citizen of the UnitedStates, residing at Cleveland, in the county of Cuyahoga and State ofOhio, have invented certain new and useful Improvements in Cam MillingMachines; and I do declare that the following is a full, clear, andexact description of the invention, which will enable others skilled inthe art to which it appertain's to make and use the same.

My invention relates to cam-milling machines; and the invention consistsin a machine constructed and adapted to operate substantially as shownand described, andparticularly pointed out in the claims.

In the accompanymg drawings, Figure 1 is a side elevation of themachine, and Fig. 2 is a front elevation thereof. Fig. 3 is a plan viewwith some of the parts horizontally sectioned, and Fig. 4 is across-section of the machine on line 0c 00, Fig. 3. i Fig. 5 is asectional elevation of themachine on a line corresponding to z 2, Fig.6; and Fig. 6 is a sectional elevation corresponding to line y 1 Fig. 5.

The machine thus shown is designed to mill cams of various sizes andcontour which have oppositely-walled channels upon their faces; and themachine contemplates especially the doing of this work with perfectuniformity in all portions of the cam groove or track whether near to orfarther removed from the center or axis of rotation, and to this end theoperating mechanism provides for differentiating or varying the speed ofro 'tation of the cam in respect to the millingtool according as thetool is working at one point or another or as it may be nearer to orfarther from the center of rotation, as above indicated, thus making thecam move at the desired rate of speed all the time in whatever portionthereof the tool may be engaged.

A represents the base of the machine, and B a bed slidable in guidewaystherein and carrying the milling-tool and other parts, as will be seenfarther along.

C represents the master or controlling cam, which is part of the machineand is of a flatring shape, as seen in Fig. 3.

D is the cam or work wrought upon by the 3 milling-tool and is adaptedto be temporarily secured in position for milling and to be removed andanother placed in its seat, and so on as each cam is finished in itsturn: The cam D therefore is not a part of the machine.

E is a back supporting gear-wheel for both cams and upon the front sideof which the master-cam is rigidly secured and held in positionrelatively as seen in Fig. 3. The said support is fixed at its rear upona head or heavy disk-shaped fiangef, carried b a relatively short andheavy shaft or spindle F, working in a suitable bearing upon the mainframe. The said cam-support E is a gear member andis providedcentrallywith a short pin or projection d, upon which the cam D to bemilled is engaged through'its hub (1 and screws or other means may beemployed to fasten cam D temporarily upon said support. This brings thecam-tracks or walled cam-channels c of master-camC and the camtracksd ofwork-cam D into the same vertical or face plane, Fig. 3, and rendersavailable my special style of milling mechanism, as will now appear. Inthis connection it is to be observed that the two tracks are exactcounterparts of each other in contour or outline, though ofwidely-difierent proportions in cross-section, and the track 0 of themaster or governing cam acts as a guide for the work done by themilling-tool in track (1 through the instrumentality of guide-head G.The said guide-head G is of substantially triangular face outline, asseen in Fig. 5, and has proportions otherwise relatively as seen inFigs. 1 and 6 and is s lined or fixed at its lower angle on rock-sha tH. A shaft J, which carries the milling-tool L, has its bearings in theinner of the upper angles of said head, and guide-roller N, which runsin cam-track 0 of the mastercam, is mounted 011 its own shaft n, in theouter angle thereof, and is adapted to be separately moved into and outof engagement with said track by moving its shaft axially through handlea thereon. However, the bed B, Figs. 2 and 6, which carries head G andother parts, is adapted to be bodily moved toward and from the cam arts,and thus both millingtool L and gui e-roller N may be carried into andout of working relation with said cams at once as the operations of themachine may require. Such adjustment of base B is effected throughhand-controlled screw K, having hand-wheel 7c, Fig. 5, and said bed hasdovetailed or other suitable guides on the base A. Power is applied tothis mechanism through pulleys P on shaft R, and different lines ofconnection are made with this shaft as power is needed here and there,as will now appear. Thus one line has to do with the actuation of themilling-tool and another with the rotation of the master-cam, and thereis a subordinate or incidental line of speed-regulating mechanism offfrom the mill-driving mechanism.

Power-shaft R is supported in suitable bearings on or from base Btransversely at one end of the machine, and power is conveyed therefromto tool shaft J through bevel-gear 2 on shaft R, meshing with bevelgear3, mounted on a sleeve 4, which is supported upon an extension ofrockshaft H. The sleeve4 is free to turn on shaft H and car ries apinion 5, in mesh with gear S 011 millingtool shaft J and through whichpower is transmitted to said tool.

Regulation of the speed of the milling-tool is back from the master-camthrough head G, rock-shaft H, toothed segment it upon said shaft H,pinion h on short shaft 7L2, engaged by said segment 72,, and gear 7L3on the other end of shaft k engaging the slidable rack-plate H on bed B.The said rackplate H carries a post it, through the upper portion ofwhich the power-shaft R extends and in which said shaft is rigidlyfixed, so that said shaft is moved axially in its bearings by or throughsaid rack-plate, and the power-engaged pulleys P and gear 2 have saidshaft in sliding relation therewith, as well as being rotated thereby,and such connection or relation may be effected in any good mechanicalway, as by sleeves or the like. Finally, as to power-shaft R, it carriesa friction-wheel 7, which engages at its periphery with the face offriction-disk 8 upon shaft T, 'and the speed of rotation of themaster-cam is determined through this line of mechanism, and especiallyas it is affected or controlled by the position of wheel 7 in relationto friction-disk 8 on a principle now well known in speed-variablemechanisms.

Power may be communicated to the master-eam, or rather to itssupporting-gear E, from shaft T by any suitable connections; but in thisinstance the connection is made by a belt 12 from shaft T toparallelpulleyshafts 13 and 14, carrying difierential pulleys which areoperatively united by a band 16, and a worm 17 on shaft 14, working withcar 18 on shaft 20, Fig. 4. A worm 22 on shaft 20 engages the master-camsupporting-gear E, and thus by this series of coacting parts power istransmitted to gear E from powershaft R through the variable-speedmechanism in wheel 7 and friction-disk 8. Gear 18 on shaft 20, Fig. 4,is frictionally engaged by disk 23 on its face, fixed to rotate withsaid shaft, and a nut 24 locks said parts operatively together. Byreleasing nut 24 and loosening disk 23 the shaft 20 can be rotated byhand by inserting an instrument in hole 25 or by any other availablemeans or way.

Now, having the various parts constructed, arranged, and operativelyunited as hercinbefore described, power is distributed or obtained fromshaft R, which runs at any suitable regular speed, and its first directapplication of power is to the milling-tool l 1. This tool is of a sizecorresponding substantially to the size of the cam-groove incross-section, and varying sizes of tools are used with varying sizes ofcams. Obviously also if the size of cam D be changed a correspondingchange is made in the master-cam, and the same is true as to varyingcontours of the 2am 1) whether the sizes be large or small; but it isdesirable that the milling-tool should work uniformly in its travelabout cam D, and such uniformity extends to the speed of rotation ofsaid cam, as well as to its work on both sides of the walls (Z thereof.The latter effect is gotten through properly centering the tool in andthrough guid e-head G, and uniformity of speed is obtained through thespeed-variable mechanism culminating in parts 7 and 8, having in mindthe longer travel about the outer circuits of the cam farthest from thecenter of rotation and the inner circuits nearer said center. Ittherefore follows that as the center or axis of rotation is left by thetool for work in the outer circuits the travel, or speed of the camshould be correspondingly slackened and as said center is approached itshould be increased. The initiative of these changes both ways is inhead G, with its rock-shaft H working thence positively upon power-shaftR and carrying wheel? to a corresponding relation to or upon the face ofdisk 8, and speed of disk 8 is increased or diminished as wheel 7approaches to or goes from its center. This regulates the rotation speedof the cam by way of shaft T, as already described. The work of themilling-tool is therefore automatically controlled as to its speed andcenter of work, and the primary speed may be regulated in any usual waythrough or upon power-shaft R.

The shaft T is supported at one end on a yoke 30 from an arm 31 on themain frame or base and by an arm 32 at the other end, and lateralprojections 33 and 34 from the side of base A support shafts 13 and 14.

What I claim is 1. In cam-milling machines, a rotatable gear-supportconstructed at its center to carry a cam and a master-cam ring on theouter face of said support, a guide-head and a projection thereonengaged in said mastercam, anda milling-tool rotatably supported on saidhead, a rock-shaft carrying said head, and means actuated through saidshaft to vary the speed of rotation of said camsupport comprisinggear-and-rack mechanism and a sliding shaft operated thereby, afriction-roller on said shaft, a friction-disk engaged by said roller,and a train of power drive mechanism leading back to said gearsupport.

2. In a cam-milling machine, a suitable base and a slidable bed thereon,a rock-shaft on said bed and. a guide-head fixed to said shaft, amilling-tool and shaft therefor supported on said guide-head, arotatable master cam, a roller on said head engaged with said cam, arotatable support carrying said cam and mechanism to rotate said supportcomprising a worm-gear member and drive-shaft 20 therefor, parallelulley-shafts 13 and 14 and gearing and be ting connections with saidshaft 20, a friction-disk and shaft for operating shafts 13 and 14, aslidable shaft and friction-wheel to operate said disk, and

rack-and-gear mechanism for said slidable shaft having operatingconnections with said rock-shaft.

3. In a cam-milling machine, a suitable base and a slidable bed thereon,a rock-shaft supported on said bed and a rocking head fixed on saidshaft, a milling-tool shaft and drivegear therefor supported on saidhead, a guide roller and a shaft therefor slidably supported on saidhead, a master-cam engaged by said roller, means to rotate said camhaving actuating connection with the power shaft and speed-varyingmechanism therefor actuated from said rock-shaft, and means to slidesaid bed carrying the millingtool and guide-roller parts back and forthin respect to the work and master-cam.

4. In a cam-milling machine, a base and a slidable bed thereon, arocking guide-head su ported on said bed, a master-cam and a rol er onsaid head engaged in said cam, a

roller for independent throw-out movement thereof.

5. In a cam-milling machine, a base and a slidable bed thereon, means toslide said bed back and'forth, a power drive-shaft slidably supportedupon said bed, a rock-shaft and guide-head thereon supported upon saidbed, a friction-roller on said drive-shaft and a friction-disk engagedbysaid roller, rack-andgear mechanism having operative connection withsaid rock-shaft and adapted to slide said drive shaft, a rotatablegear-support for a master-cam and the work, a milling-tool and shafttherefor supported on said rocking guide-head and having gearconnections with said drive-shaft, a slidably-supported roller upon saidguide-head adapted to engage the master-cam, and power drive mechanismleading from said friction-disk to said rotatable gear-support.

6. In cam-milling machines, a rotatable gear-support for a master-camand the work, a suitable base, a slidable bed on said base, a rockingguide-head and a tool-shaft and milling-tool thereon supported on saidbed, a guide-roller for said guide-head, a driveshaft slidably mountedon said slidable bed, operative connections between said rockingguide-head and said drive-shaft adapted to slide said shaft as said headis rocked, and friction drive mechanism operated by said drive-shaft andhaving drive connections for said rotatable gear-support.

In testimony whereof I sign this specification in the presence of twowitnesses.

SAMUEL ASHTON HAND.

